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Her hatred and lack of empathy for me taught me how to treat other people. It's standard, especially in the US, Canada and UK, to be polite no matter what. I don't follow that norm any more and sometimes people don't know how to deal with it.
Join the fucking club. My mother was and still is a cruel bitch. But I don’t blame her for my actions now. My actions are my own. Good or bad. No excuses. Jump off your cross and use the wood to build a bridge and stfu.
If you're now an adult, it's your choice to follow your mother's teachings or not.
As @Ellenna said, don't be held prisoner by your mom's habits or personality. It's your choice as an adult how you want to live and treat others. If you're OK with being a raging asshat to everyone, then fine. Just don't expect them to like you or want to be around you all the time.
If you are aware enough to tells us all of this then you are more than capable of doing something about it.
What you need is a moral compass, and some cognitive behavioral therapy. Seriously, if you aren't trolling then heed my advice, and it will change your life for the better.